What kind of argument is that? Is that a 'shake things up' take?
If you have a dictator who bases his entire regime on anti-US sentiment, constantly bombarding his country with anti-US propaganda, you don't give that dictator more ammo to use. Put yourself in the shoes of a citizen of DPRK- you see and hear the US president talk about totally destroying your country, and the US has totally destroyed your country before. I mean, completely leveled it to where there was no target left to destroy. The people believe that the US is an aggressor and will try to destroy them. You don't go and tell those people that the US is going to totally destroy you, regardless of the condition for that destruction. It's stupid.
Even Putin was publicly calling Trump out about being stupid and doing exactly what DPRK wants with the rhetoric.